strata, rock layers are called , sedimentary, layers mostly form in ___ rock, absolute, ___ dating uses radioactive elements in rock to give an exact age, relative, ___ dating uses the order of rock layers to tell the approximate age of the rock, law of original horizontality, states that all rock layers start out horizontal - each layer flat top and bottom, law of superposition, states that the oldest rock layers are on the bottom and the youngest layers are on the top, law of crosscutting relationships, states that things that cut across rock layers are younger that the layers the ycut, fault, a crack in rock layers - shown as a thin diagonal line cutting across layers, igneous intrusion, magma cuts across rock layer and cools into rock - shown as a thick pipe or blob.

Superposition

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